<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>练习5：DOM操作</title>
		<style type="text/css">
			html,div,ul,li {margin: 0px;padding: 0px;}
			a{cursor: pointer;}
			li {list-style: none;cursor: pointer;}
			fieldset {border: #000 1px dashed;width: 225px;height: 225px;padding: 10px;text-align: center;float: left;margin-left: 5px;}
			#cont_left {width: 300px;height: 500px;float: left;}
			#cont_right {float: left;}
			.newcss1{background-color: yellowgreen;}
		</style>
	</head>
	<body>
		<div id="cont_left">
			<ul><img src="img/fold.gif"><a onclick="show('menu1')"> 通过DOM获取信息 </a>
				<ul id="menu1" class="ces">
					<li onclick="showImg()"><img src="img/doc.gif">获取原始图片路径</li>
					<li onclick="getFruit()"><img src="img/doc.gif">获取我喜欢的水果</li>
				</ul>
			</ul>

			<ul><img src="img/fold.gif"><a onclick="show('menu2')"> 通过DOM操作元素 </a>
				<ul id="menu2" class="ces">
					<li onclick="createImg()"><img src="img/doc.gif">创建图片</li>
					<li onclick="cloneImg()"><img src="img/doc.gif">克隆图片</li>
					<li onclick="changeImg()"><img src="img/doc.gif">改变图片</li>
					<li onclick="removeImg()"><img src="img/doc.gif">删除图片</li>
				</ul>
			</ul>

			<ul><img src="img/fold.gif"><a onclick="show('menu3')"> 通过DOM操作样式 </a>
				<ul id="menu3" class="ces">
					<li onclick="changeCss1()"><img src="img/doc.gif">为原始图片加上行间样式</li>
					<li onclick="changeCss2()"><img src="img/doc.gif">为所有的fieldset加上内部样式</li>
				</ul>
			</ul>

		</div>
		<fieldset>
			<legend>原始图片</legend>
			<img id="fruit" src="img/fruit.jpg">
		</fieldset>
		<fieldset>
			<legend>图片路径</legend>
			<p id="msg1">在这里显示</p>
		</fieldset>
		<fieldset>
			<legend>选择你喜欢的水果</legend>
			<ul style="text-align: left;">
				<li>
					<input name="enjoy" type="checkbox" value="苹果" />苹果
				</li>
				<li>
					<input name="enjoy" type="checkbox" value="香蕉" checked="checked" />香蕉
				</li>
				<li>
					<input name="enjoy" type="checkbox" value="葡萄" />葡萄
				</li>
				<li>
					<input name="enjoy" type="checkbox" value="梨" checked="checked" />梨
				</li>
				<li>
					<input name="enjoy" type="checkbox" value="西瓜" />西瓜
				</li>
			</ul>
			<div id="msg2" style="margin-top: 10px;text-align: left;"></div>
		</fieldset>
		<fieldset>
			<legend>创建图片</legend>
			<div id="msg3"></div>
		</fieldset>
		<fieldset>
			<legend>克隆图片</legend>
			<div id="msg4"></div>
		</fieldset>
		<script>
			//菜单收缩与扩展 209020341 蔡文昌
			function show(title) {
				// let currentMenu = document.getElementById(title);
				// let currentStatus = currentMenu.style.display;
				// currentMenu.style.display = currentStatus === "" ? "none" : "";
                var currentMenu = document.getElementById(title);
                var menus = document.getElementsByClassName('ces');
                for (var i = 0; i < menus.length; i++) {
                    if (menus[i].id !== currentMenu.id) {
                        menus[i].style.display = 'none';
                    }
                }
                currentMenu.style.display = currentMenu.style.display === 'block' ? 'none' : 'block';
			}
			//获取原始图片路径 209020341 蔡文昌
			function showImg() {
                var img=document.getElementById("fruit").getAttribute('src');
                document.getElementById('msg1').innerHTML=img;
			}
			//获取喜欢的水果 209020341 蔡文昌
			function getFruit() {
                obj = document.getElementsByName("enjoy");
                check_val = [];
                for(k in obj){
                    if(obj[k].checked)
                        check_val.push(obj[k].value);
                }
                document.getElementById('msg2').innerHTML="你喜欢的水果是:"+check_val;
			}
			//创建图片 209020341 蔡文昌
			function createImg() {
                var imgNode = document.createElement('img');
                imgNode.setAttribute('src','img/grape.jpg');
                document.getElementById('msg3').appendChild(imgNode);
			}
			//克隆图片 209020341 蔡文昌
			function cloneImg() {
				var p = document.getElementById('fruit');
                var a = p.cloneNode(true);
                document.getElementById("msg4").appendChild(a);
			}
			//改变图片 209020341 蔡文昌
			function changeImg() {
				var img1 = document.getElementById("fruit");
                img1.src="img/grape.jpg";
			}
			//删除图片 209020341 蔡文昌
			function removeImg() {
				var list = document.getElementById("fruit");
                var img1 = list.parentNode;
                img1.removeChild(list);
			}
			//操作样式1 209020341 蔡文昌
			function changeCss1(){
				document.getElementById("fruit").style.border="solid 4px red";
			}
			//操作样式2 209020341 蔡文昌
			function changeCss2(){
				var a = document.getElementsByTagName("fieldset");
                for(var b=0;b<a.length;b++){
                    a[b].style.background = "green";
                }
            }
		</script>
	</body>
</html>
